66211472 has 10 divisors (see below), whose sum is σ = 128284758. Its totient is φ = 33105728.

The previous prime is 66211471. The next prime is 66211489. The reversal of 66211472 is 27411266.

66211472 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 54405376 + 11806096 = 7376^2 + 3436^2 .

It is not an unprimeable number, because it can be changed into a prime (66211471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2069093 + ... + 2069124.

Almost surely, 2^66211472 is an apocalyptic number.

It is an amenable number.

66211472 is a deficient number, since it is larger than the sum of its proper divisors (62073286).

66211472 is a wasteful number, since it uses less digits than its factorization.

66211472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4138225 (or 4138219 counting only the distinct ones).

The product of its digits is 4032, while the sum is 29.

The square root of 66211472 is about 8137.0431976241. The cubic root of 66211472 is about 404.5551626551. Note that the first 3 decimals are identical.

The spelling of 66211472 in words is "sixty-six million, two hundred eleven thousand, four hundred seventy-two".